<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条 -->
      <el-steps :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- 表单区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
      <!-- tab栏区域 -->
        <el-tabs 
        :tab-position="'left'" 
        v-model="activeIndex" 
        :before-leave='beforeTabLeave'
        @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <!-- 级联选择器 -->
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="{ expandTrigger: 'hover',label:'cat_name',value:'cat_id',children:'children' }"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 --> 
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品图片" name="3">
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
             <quill-editor v-model="addForm.goods_introduce"></quill-editor>
             <!-- 添加按钮 -->
             <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>

        </el-tabs>

      </el-form>

    </el-card>

    <!-- 图片预览对话框 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Add',
  data() {
    // 自定义验证规则
    var checkNumber = (rule, value, cb) => {
      if (value > 0) {
        return cb()
      }
      cb(new Error('此项必须大于零'))
    }
    return {
      // 步骤条下标
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat:[],
        // 图片的数组
        pics:[],
        // 商品的详情描述
        goods_introduce:'',
        attrs:[]
      },
      // 添加商品的表单验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
        ],
        goods_price: [
          // { required: true, message: '请输入商品价格', trigger: 'blur' },
          { required: true,validator:checkNumber, trigger: 'blur' },
        ],
        goods_weight: [
          { required: true,validator:checkNumber, trigger: 'blur' },
        ],
        goods_number: [
          { required: true,validator:checkNumber, trigger: 'blur' },
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' },
        ],
      },
      // 商品分类信息
      cateList: [],
      // 动态参数列表数据
      manyTableData:[],
      // 静态属性列表数据
      onlyTableData:[],
      // 上传图片的url地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj:{
        Authorization:window.sessionStorage.getItem('token')
      },
      // 预览图片路径
      previewPath:'',
      // 控制图片预览对话框的显示与隐藏
      previewVisible:false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error(
          '加载商品分类数据失败，状态码为：' + res.meta.status
        )
      }
      this.cateList = res.data
    },
    // 级联选择器选中项发生变化会触发此函数
    handleChange(){
      if(this.addForm.goods_cat.length !== 3){
        this.addForm.goods_cat=[]
      }
    },
    // tab切换时触发的函数
    beforeTabLeave(_,oldActiveName){
      if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
        this.$message.error('请先选择第三级商品分类！')
        return false
      }
    },
    // tab项点击事件
    async tabClicked(){
      // 证明访问的是动态参数面板
      if(this.activeIndex === '1'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{sel:'many'}
        })
        if(res.meta.status !== 200){
          return this.$message.error('加载动态参数信息失败，状态码为：'+res.meta.status)
        }
        // 将attr_vals属性值转换为一个数组
        res.data.forEach(item=>{
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        })
       this.manyTableData = res.data
      }
      else if(this.activeIndex === '2'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{sel:'only'}
        })
        if(res.meta.status !== 200){
          return this.$message.error('加载静态属性信息失败，状态码为：'+res.meta.status)
        }
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file){
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file){
      // 获取图片临时路径
      const filePath = file.response.data.tmp_path
      // 从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 移除图片信息
      this.addForm.pics.splice(i,1)
    },
    // 监听图片上传成功的事件
    handleSuccess(response){
      // 1、拼接得到一个图片信息对象
      const picInfo = {pic:response.data.tmp_path}
      // 2、将图片信息对象push到pics数组中
      this.addForm.pics.push(picInfo)
    },
    // 添加商品
    add(){
      this.$refs.addFormRef.validate(async valid=>{
        if(!valid){
          return this.$message.error('基本信息格式错误，添加失败！')
        }
        // 执行添加的业务逻辑
        const form = JSON.parse(JSON.stringify(this.addForm))
        form.goods_cat = form.goods_cat.join(',')
        
        // 处理动态参数
        this.manyTableData.forEach(item =>{
          const newInfo = {
            attr_id:item.attr_id,
            attr_value:item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })

        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id:item.attr_id,
            attr_value:item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs

        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const {data:res} = await this.$http.post('goods',form)
        if(res.meta.status === 400){
          return this.$message.error('该商品已经存在，添加商品失败！')
        }
        if(res.meta.status !== 201){
          return this.$message.error('添加商品失败，状态码为：'+res.meta.status)
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    },
  },
  computed:{
    cateId(){
      if(this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox{
  margin: 0 10px 0 0 !important;
}
.previewImg{
  width: 100%;
}
.btnAdd{
  margin-top: 15px;
}
</style>